Geochemical Study of Rare Earth Elements Content in Tabas Coal Ash, Parvadeh Coal Mine
محل انتشار: مجله معدن و محیط زیست، دوره: 12، شماره: 4
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 163
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شناسه ملی سند علمی:
JR_JMAE-12-4_017
تاریخ نمایه سازی: 29 فروردین 1401
چکیده مقاله:
The most extensive Iranian coal-bearing basin is located in an area of ۳۰۰۰۰ km۲, situated approximately ۷۵ km from the Tabas county, south Khorasan Province, Iran. In this work, the Tabas coal ash is studied and investigated for the purpose of determination of the rare earth elements (REE) content, and the identification of the distribution patterns of trace elements. The elemental and phase analysis experiments were conducted using the X-ray diffraction (XRD), inductively-coupled plasma spectroscopy (ICP-MS), wet chemical analysis, and field emission scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (FE-SEM/EDS) techniques. The XRD results showed that the phases in the Tabas coal ash were quartz, clay minerals, alkali feldspar, magnetite, and pyrite in order of abundance. The elemental analysis showed that the major elements were Si, Al, K, Fe, Mg, S, and Na, which was in good accordance with the chemical composition of the recognized minerals by the XRD method. The concentration of REEs was varied from ۰.۱۰ ppm (for Tm) to ۶۸.۴۸ ppm (for Ce), with an arithmetic mean of ۱۴.۱۹ ppm. The abundance of ۱۶ REE elements was or even below the average of the earth crust abundances. Only one rare earth element (Samarium) was about ۴.۴ and ۲.۲ times more abundant than in the earth crust and in the world coking coal ashes. In order to further assess the occurrence states of REEs in each of detected mineral, the Fe-SEM/EDX method was used. The SEM/EDS analysis showed that REEs were mainly concentrated in the clay minerals.
کلیدواژه ها:
نویسندگان
G. Jozanikohan
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
M. Nosrati Abarghooei
Faculty of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran
H. Sedighi
The head of REE project, Iranian Mines & Mining Industries Development & Renovation (Imidro)
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